statistics

Q: Which of the following is correct property for joint probability distribution of X and Y:

(a) :  Sigma f(X,Y)=1
(b) :  Sigma f(Y,X)=1
(c) :  Both of above
(d) :  None of above
(e) :  NONE
Answer:  Sigma f(X,Y)=1
Explanation:  

Q: The interquartile range is

(a) :  the 50th percentile
(b) :   another name for the variance
(c) :   the difference between the largest and smallest values
(d) :  the difference between the third quartile and the first quartile
(e) :  NONE
Answer:  the difference between the third quartile and the first quartile
Explanation:  

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